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+--
+-- Perl Weekly Challenge 263
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-263>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc263;
+
+CREATE OR REPLACE FUNCTION
+pwc263.task2_plpgsql( i int[], j int[] )
+RETURNS TABLE( item int, qty int )
+AS $CODE$
+DECLARE
+
+BEGIN
+
+	CREATE TEMPORARY TABLE IF NOT EXISTS q( item int, qty int );
+	TRUNCATE TABLE q;
+
+	FOR x IN 1 .. array_length( i, 1 ) LOOP
+	    IF mod( x, 2 ) = 0 THEN
+	       CONTINUE;
+	    END IF;
+	    INSERT INTO q( item, qty )
+	    VALUES ( i[ x ], i[ x + 1 ] );
+
+	END LOOP;
+
+	FOR x IN 1 .. array_length( j, 1 ) LOOP
+	     IF mod( x, 2 ) = 0 THEN
+	       CONTINUE;
+	    END IF;
+	    INSERT INTO q( item, qty )
+	    VALUES ( j[ x ], j[ x + 1 ] );
+
+	END LOOP;
+
+	RETURN QUERY
+	SELECT q.item, sum( q.qty )::int
+	FROM q
+	GROUP BY q.item;
+
+END
+$CODE$
+LANGUAGE plpgsql;